1 files changed, 71 insertions, 0 deletions
diff --git a/src/PrbsGenerator.h b/src/PrbsGenerator.h
new file mode 100644
index 0000000..0c29965
--- /dev/null
+++ b/src/PrbsGenerator.h
@@ -0,0 +1,71 @@
+/*
+   Copyright (C) 2005, 2006, 2007, 2008, 2009 Her Majesty the Queen in Right
+   of Canada (Communications Research Center Canada)
+   */
+/*
+   This file is part of ODR-DabMux.
+
+   ODR-DabMux is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as
+   published by the Free Software Foundation, either version 3 of the
+   License, or (at your option) any later version.
+
+   ODR-DabMux is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with ODR-DabMux.  If not, see <http://www.gnu.org/licenses/>.
+   */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#ifdef HAVE_CONFIG_H
+#   include "config.h"
+#endif
+
+class PrbsGenerator {
+    public:
+        void setup(uint32_t polynomial);
+
+        uint8_t step(void);
+
+        void rewind(void);
+
+    private:
+        /* Generate a table of matrix products to update a 32-bit PRBS
+         * generator. */
+        void gen_prbs_table(void);
+
+        /* Update a 32-bit PRBS generator eight bits at a time. */
+        uint32_t update_prbs(void);
+
+        /* Generate the weight table. */
+        void gen_weight_table(void);
+
+        /* Count the number of errors in a block of received data. */
+        size_t error_count(
+                uint8_t *rx_data,
+                size_t rx_data_length);
+
+        void gen_sequence(
+                uint8_t *tx_data,
+                size_t tx_data_length,
+                uint32_t polynomial);
+
+        // table of matrix products used to update a 32-bit PRBS generator
+        uint32_t prbs_table [4] [256];
+        // table of weights for 8-bit bytes
+        uint8_t weight[256];
+        // PRBS polynomial generator
+        uint32_t polynomial;
+        // PRBS generator polarity mask
+        uint8_t polarity_mask;
+        // PRBS accumulator
+        uint32_t accum;
+};
+